Tens of thousands of different kinds to select from to have your office Desk/chair sliding easily right and left, install the VXB005200CR. Diameter size of the caster wheel has a metric standard 200mm which is equal to 7.874" inch with imperial units. The thickness of the wheel is 50mm or 1.969" inch. The Caster with the wheel from end to end is 240mm = 9.449" inch. Top Plate is the method of installing the caster to your equipment, here are the dimensions 100mm x 115mm with the holes distance of 75mm x 85mm. This caster wheel core material is Rubber and has a Rubber tire spinning over Roller bearing. Each caster will carry the load of 661 lb and is Swivel type. The caster temperature range = -40 to 180 F. Very important notice, you need to buy the VXB005200CR in order to get one :).